名词
中文翻译：主要时态同义词
同义词：
['primary tense', 'primary tenses']
例句：
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1. The teacher asked the students to use primary tenses in their writing.
老师要求学生们在写作中使用主要时态。
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2. Primary tenses are used to describe events that happened before the present time.
主要时态用于描述发生在现在时间之前的事件。
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3. In primary tenses, we use the past tense form of verbs and the present perfect tense form of verbs.
在主要时态中，我们使用动词的过去形式和现在完成形式的动词。